1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _SCSI_SCSI_DEVICE_H 3 #define _SCSI_SCSI_DEVICE_H 4 5 #include <linux/list.h> 6 #include <linux/spinlock.h> 7 #include <linux/workqueue.h> 8 #include <linux/blkdev.h> 9 #include <scsi/scsi.h> 10 #include <linux/atomic.h> 11 #include <linux/sbitmap.h> 12 13 struct device; 14 struct request_queue; 15 struct scsi_cmnd; 16 struct scsi_lun; 17 struct scsi_sense_hdr; 18 19 typedef __u64 __bitwise blist_flags_t; 20 21 #define SCSI_SENSE_BUFFERSIZE 96 22 23 struct scsi_mode_data { 24 __u32 length; 25 __u16 block_descriptor_length; 26 __u8 medium_type; 27 __u8 device_specific; 28 __u8 header_length; 29 __u8 longlba:1; 30 }; 31 32 /* 33 * sdev state: If you alter this, you also need to alter scsi_sysfs.c 34 * (for the ascii descriptions) and the state model enforcer: 35 * scsi_lib:scsi_device_set_state(). 36 */ 37 enum scsi_device_state { 38 SDEV_CREATED = 1, /* device created but not added to sysfs 39 * Only internal commands allowed (for inq) */ 40 SDEV_RUNNING, /* device properly configured 41 * All commands allowed */ 42 SDEV_CANCEL, /* beginning to delete device 43 * Only error handler commands allowed */ 44 SDEV_DEL, /* device deleted 45 * no commands allowed */ 46 SDEV_QUIESCE, /* Device quiescent. No block commands 47 * will be accepted, only specials (which 48 * originate in the mid-layer) */ 49 SDEV_OFFLINE, /* Device offlined (by error handling or 50 * user request */ 51 SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */ 52 SDEV_BLOCK, /* Device blocked by scsi lld. No 53 * scsi commands from user or midlayer 54 * should be issued to the scsi 55 * lld. */ 56 SDEV_CREATED_BLOCK, /* same as above but for created devices */ 57 }; 58 59 enum scsi_scan_mode { 60 SCSI_SCAN_INITIAL = 0, 61 SCSI_SCAN_RESCAN, 62 SCSI_SCAN_MANUAL, 63 }; 64 65 enum scsi_device_event { 66 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */ 67 SDEV_EVT_INQUIRY_CHANGE_REPORTED, /* 3F 03 UA reported */ 68 SDEV_EVT_CAPACITY_CHANGE_REPORTED, /* 2A 09 UA reported */ 69 SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED, /* 38 07 UA reported */ 70 SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED, /* 2A 01 UA reported */ 71 SDEV_EVT_LUN_CHANGE_REPORTED, /* 3F 0E UA reported */ 72 SDEV_EVT_ALUA_STATE_CHANGE_REPORTED, /* 2A 06 UA reported */ 73 SDEV_EVT_POWER_ON_RESET_OCCURRED, /* 29 00 UA reported */ 74 75 SDEV_EVT_FIRST = SDEV_EVT_MEDIA_CHANGE, 76 SDEV_EVT_LAST = SDEV_EVT_POWER_ON_RESET_OCCURRED, 77 78 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1 79 }; 80 81 struct scsi_event { 82 enum scsi_device_event evt_type; 83 struct list_head node; 84 85 /* put union of data structures, for non-simple event types, 86 * here 87 */ 88 }; 89 90 /** 91 * struct scsi_vpd - SCSI Vital Product Data 92 * @rcu: For kfree_rcu(). 93 * @len: Length in bytes of @data. 94 * @data: VPD data as defined in various T10 SCSI standard documents. 95 */ 96 struct scsi_vpd { 97 struct rcu_head rcu; 98 int len; 99 unsigned char data[]; 100 }; 101 102 struct scsi_device { 103 struct Scsi_Host *host; 104 struct request_queue *request_queue; 105 106 /* the next two are protected by the host->host_lock */ 107 struct list_head siblings; /* list of all devices on this host */ 108 struct list_head same_target_siblings; /* just the devices sharing same target id */ 109 110 struct sbitmap budget_map; 111 atomic_t device_blocked; /* Device returned QUEUE_FULL. */ 112 113 atomic_t restarts; 114 spinlock_t list_lock; 115 struct list_head starved_entry; 116 unsigned short queue_depth; /* How deep of a queue we want */ 117 unsigned short max_queue_depth; /* max queue depth */ 118 unsigned short last_queue_full_depth; /* These two are used by */ 119 unsigned short last_queue_full_count; /* scsi_track_queue_full() */ 120 unsigned long last_queue_full_time; /* last queue full time */ 121 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */ 122 #define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ) 123 124 unsigned long last_queue_ramp_up; /* last queue ramp up time */ 125 126 unsigned int id, channel; 127 u64 lun; 128 unsigned int manufacturer; /* Manufacturer of device, for using 129 * vendor-specific cmd's */ 130 unsigned sector_size; /* size in bytes */ 131 132 void *hostdata; /* available to low-level driver */ 133 unsigned char type; 134 char scsi_level; 135 char inq_periph_qual; /* PQ from INQUIRY data */ 136 struct mutex inquiry_mutex; 137 unsigned char inquiry_len; /* valid bytes in 'inquiry' */ 138 unsigned char * inquiry; /* INQUIRY response data */ 139 const char * vendor; /* [back_compat] point into 'inquiry' ... */ 140 const char * model; /* ... after scan; point to static string */ 141 const char * rev; /* ... "nullnullnullnull" before scan */ 142 143 #define SCSI_VPD_PG_LEN 255 144 struct scsi_vpd __rcu *vpd_pg0; 145 struct scsi_vpd __rcu *vpd_pg83; 146 struct scsi_vpd __rcu *vpd_pg80; 147 struct scsi_vpd __rcu *vpd_pg89; 148 unsigned char current_tag; /* current tag */ 149 struct scsi_target *sdev_target; 150 151 blist_flags_t sdev_bflags; /* black/white flags as also found in 152 * scsi_devinfo.[hc]. For now used only to 153 * pass settings from slave_alloc to scsi 154 * core. */ 155 unsigned int eh_timeout; /* Error handling timeout */ 156 unsigned removable:1; 157 unsigned changed:1; /* Data invalid due to media change */ 158 unsigned busy:1; /* Used to prevent races */ 159 unsigned lockable:1; /* Able to prevent media removal */ 160 unsigned locked:1; /* Media removal disabled */ 161 unsigned borken:1; /* Tell the Seagate driver to be 162 * painfully slow on this device */ 163 unsigned disconnect:1; /* can disconnect */ 164 unsigned soft_reset:1; /* Uses soft reset option */ 165 unsigned sdtr:1; /* Device supports SDTR messages */ 166 unsigned wdtr:1; /* Device supports WDTR messages */ 167 unsigned ppr:1; /* Device supports PPR messages */ 168 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */ 169 unsigned simple_tags:1; /* simple queue tag messages are enabled */ 170 unsigned was_reset:1; /* There was a bus reset on the bus for 171 * this device */ 172 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN 173 * because we did a bus reset. */ 174 unsigned use_10_for_rw:1; /* first try 10-byte read / write */ 175 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */ 176 unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */ 177 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */ 178 unsigned no_write_same:1; /* no WRITE SAME command */ 179 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */ 180 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */ 181 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */ 182 unsigned skip_vpd_pages:1; /* do not read VPD pages */ 183 unsigned try_vpd_pages:1; /* attempt to read VPD pages */ 184 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */ 185 unsigned no_start_on_add:1; /* do not issue start on add */ 186 unsigned allow_restart:1; /* issue START_UNIT in error handler */ 187 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */ 188 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */ 189 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */ 190 unsigned select_no_atn:1; 191 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */ 192 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */ 193 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */ 194 unsigned last_sector_bug:1; /* do not use multisector accesses on 195 SD_LAST_BUGGY_SECTORS */ 196 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */ 197 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */ 198 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */ 199 unsigned security_supported:1; /* Supports Security Protocols */ 200 unsigned is_visible:1; /* is the device visible in sysfs */ 201 unsigned wce_default_on:1; /* Cache is ON by default */ 202 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */ 203 unsigned broken_fua:1; /* Don't set FUA bit */ 204 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */ 205 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */ 206 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device 207 * creation time */ 208 209 bool offline_already; /* Device offline message logged */ 210 211 atomic_t disk_events_disable_depth; /* disable depth for disk events */ 212 213 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ 214 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */ 215 struct list_head event_list; /* asserted events */ 216 struct work_struct event_work; 217 218 unsigned int max_device_blocked; /* what device_blocked counts down from */ 219 #define SCSI_DEFAULT_DEVICE_BLOCKED 3 220 221 atomic_t iorequest_cnt; 222 atomic_t iodone_cnt; 223 atomic_t ioerr_cnt; 224 225 struct device sdev_gendev, 226 sdev_dev; 227 228 struct execute_work ew; /* used to get process context on put */ 229 struct work_struct requeue_work; 230 231 struct scsi_device_handler *handler; 232 void *handler_data; 233 234 size_t dma_drain_len; 235 void *dma_drain_buf; 236 237 unsigned char access_state; 238 struct mutex state_mutex; 239 enum scsi_device_state sdev_state; 240 struct task_struct *quiesced_by; 241 unsigned long sdev_data[]; 242 } __attribute__((aligned(sizeof(unsigned long)))); 243 244 #define to_scsi_device(d) \ 245 container_of(d, struct scsi_device, sdev_gendev) 246 #define class_to_sdev(d) \ 247 container_of(d, struct scsi_device, sdev_dev) 248 #define transport_class_to_sdev(class_dev) \ 249 to_scsi_device(class_dev->parent) 250 251 #define sdev_dbg(sdev, fmt, a...) \ 252 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a) 253 254 /* 255 * like scmd_printk, but the device name is passed in 256 * as a string pointer 257 */ 258 __printf(4, 5) void 259 sdev_prefix_printk(const char *, const struct scsi_device *, const char *, 260 const char *, ...); 261 262 #define sdev_printk(l, sdev, fmt, a...) \ 263 sdev_prefix_printk(l, sdev, NULL, fmt, ##a) 264 265 __printf(3, 4) void 266 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...); 267 268 #define scmd_dbg(scmd, fmt, a...) \ 269 do { \ 270 if ((scmd)->request->rq_disk) \ 271 sdev_dbg((scmd)->device, "[%s] " fmt, \ 272 (scmd)->request->rq_disk->disk_name, ##a);\ 273 else \ 274 sdev_dbg((scmd)->device, fmt, ##a); \ 275 } while (0) 276 277 enum scsi_target_state { 278 STARGET_CREATED = 1, 279 STARGET_RUNNING, 280 STARGET_REMOVE, 281 STARGET_CREATED_REMOVE, 282 STARGET_DEL, 283 }; 284 285 /* 286 * scsi_target: representation of a scsi target, for now, this is only 287 * used for single_lun devices. If no one has active IO to the target, 288 * starget_sdev_user is NULL, else it points to the active sdev. 289 */ 290 struct scsi_target { 291 struct scsi_device *starget_sdev_user; 292 struct list_head siblings; 293 struct list_head devices; 294 struct device dev; 295 struct kref reap_ref; /* last put renders target invisible */ 296 unsigned int channel; 297 unsigned int id; /* target id ... replace 298 * scsi_device.id eventually */ 299 unsigned int create:1; /* signal that it needs to be added */ 300 unsigned int single_lun:1; /* Indicates we should only 301 * allow I/O to one of the luns 302 * for the device at a time. */ 303 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f 304 * means no lun present. */ 305 unsigned int no_report_luns:1; /* Don't use 306 * REPORT LUNS for scanning. */ 307 unsigned int expecting_lun_change:1; /* A device has reported 308 * a 3F/0E UA, other devices on 309 * the same target will also. */ 310 /* commands actually active on LLD. */ 311 atomic_t target_busy; 312 atomic_t target_blocked; 313 314 /* 315 * LLDs should set this in the slave_alloc host template callout. 316 * If set to zero then there is not limit. 317 */ 318 unsigned int can_queue; 319 unsigned int max_target_blocked; 320 #define SCSI_DEFAULT_TARGET_BLOCKED 3 321 322 char scsi_level; 323 enum scsi_target_state state; 324 void *hostdata; /* available to low-level driver */ 325 unsigned long starget_data[]; /* for the transport */ 326 /* starget_data must be the last element!!!! */ 327 } __attribute__((aligned(sizeof(unsigned long)))); 328 329 #define to_scsi_target(d) container_of(d, struct scsi_target, dev) 330 static inline struct scsi_target *scsi_target(struct scsi_device *sdev) 331 { 332 return to_scsi_target(sdev->sdev_gendev.parent); 333 } 334 #define transport_class_to_starget(class_dev) \ 335 to_scsi_target(class_dev->parent) 336 337 #define starget_printk(prefix, starget, fmt, a...) \ 338 dev_printk(prefix, &(starget)->dev, fmt, ##a) 339 340 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, 341 uint, uint, u64, void *hostdata); 342 extern int scsi_add_device(struct Scsi_Host *host, uint channel, 343 uint target, u64 lun); 344 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh); 345 extern void scsi_remove_device(struct scsi_device *); 346 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh); 347 void scsi_attach_vpd(struct scsi_device *sdev); 348 349 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q); 350 extern int __must_check scsi_device_get(struct scsi_device *); 351 extern void scsi_device_put(struct scsi_device *); 352 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *, 353 uint, uint, u64); 354 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, 355 uint, uint, u64); 356 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, 357 u64); 358 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, 359 u64); 360 extern void starget_for_each_device(struct scsi_target *, void *, 361 void (*fn)(struct scsi_device *, void *)); 362 extern void __starget_for_each_device(struct scsi_target *, void *, 363 void (*fn)(struct scsi_device *, 364 void *)); 365 366 /* only exposed to implement shost_for_each_device */ 367 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, 368 struct scsi_device *); 369 370 /** 371 * shost_for_each_device - iterate over all devices of a host 372 * @sdev: the &struct scsi_device to use as a cursor 373 * @shost: the &struct scsi_host to iterate over 374 * 375 * Iterator that returns each device attached to @shost. This loop 376 * takes a reference on each device and releases it at the end. If 377 * you break out of the loop, you must call scsi_device_put(sdev). 378 */ 379 #define shost_for_each_device(sdev, shost) \ 380 for ((sdev) = __scsi_iterate_devices((shost), NULL); \ 381 (sdev); \ 382 (sdev) = __scsi_iterate_devices((shost), (sdev))) 383 384 /** 385 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) 386 * @sdev: the &struct scsi_device to use as a cursor 387 * @shost: the &struct scsi_host to iterate over 388 * 389 * Iterator that returns each device attached to @shost. It does _not_ 390 * take a reference on the scsi_device, so the whole loop must be 391 * protected by shost->host_lock. 392 * 393 * Note: The only reason to use this is because you need to access the 394 * device list in interrupt context. Otherwise you really want to use 395 * shost_for_each_device instead. 396 */ 397 #define __shost_for_each_device(sdev, shost) \ 398 list_for_each_entry((sdev), &((shost)->__devices), siblings) 399 400 extern int scsi_change_queue_depth(struct scsi_device *, int); 401 extern int scsi_track_queue_full(struct scsi_device *, int); 402 403 extern int scsi_set_medium_removal(struct scsi_device *, char); 404 405 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, 406 unsigned char *buffer, int len, int timeout, 407 int retries, struct scsi_mode_data *data, 408 struct scsi_sense_hdr *); 409 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, 410 int modepage, unsigned char *buffer, int len, 411 int timeout, int retries, 412 struct scsi_mode_data *data, 413 struct scsi_sense_hdr *); 414 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, 415 int retries, struct scsi_sense_hdr *sshdr); 416 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf, 417 int buf_len); 418 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, 419 unsigned int len, unsigned char opcode); 420 extern int scsi_device_set_state(struct scsi_device *sdev, 421 enum scsi_device_state state); 422 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type, 423 gfp_t gfpflags); 424 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt); 425 extern void sdev_evt_send_simple(struct scsi_device *sdev, 426 enum scsi_device_event evt_type, gfp_t gfpflags); 427 extern int scsi_device_quiesce(struct scsi_device *sdev); 428 extern void scsi_device_resume(struct scsi_device *sdev); 429 extern void scsi_target_quiesce(struct scsi_target *); 430 extern void scsi_target_resume(struct scsi_target *); 431 extern void scsi_scan_target(struct device *parent, unsigned int channel, 432 unsigned int id, u64 lun, 433 enum scsi_scan_mode rescan); 434 extern void scsi_target_reap(struct scsi_target *); 435 extern void scsi_target_block(struct device *); 436 extern void scsi_target_unblock(struct device *, enum scsi_device_state); 437 extern void scsi_remove_target(struct device *); 438 extern const char *scsi_device_state_name(enum scsi_device_state); 439 extern int scsi_is_sdev_device(const struct device *); 440 extern int scsi_is_target_device(const struct device *); 441 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len); 442 extern int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, 443 int data_direction, void *buffer, unsigned bufflen, 444 unsigned char *sense, struct scsi_sense_hdr *sshdr, 445 int timeout, int retries, u64 flags, 446 req_flags_t rq_flags, int *resid); 447 /* Make sure any sense buffer is the correct size. */ 448 #define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense, \ 449 sshdr, timeout, retries, flags, rq_flags, resid) \ 450 ({ \ 451 BUILD_BUG_ON((sense) != NULL && \ 452 sizeof(sense) != SCSI_SENSE_BUFFERSIZE); \ 453 __scsi_execute(sdev, cmd, data_direction, buffer, bufflen, \ 454 sense, sshdr, timeout, retries, flags, rq_flags, \ 455 resid); \ 456 }) 457 static inline int scsi_execute_req(struct scsi_device *sdev, 458 const unsigned char *cmd, int data_direction, void *buffer, 459 unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout, 460 int retries, int *resid) 461 { 462 return scsi_execute(sdev, cmd, data_direction, buffer, 463 bufflen, NULL, sshdr, timeout, retries, 0, 0, resid); 464 } 465 extern void sdev_disable_disk_events(struct scsi_device *sdev); 466 extern void sdev_enable_disk_events(struct scsi_device *sdev); 467 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t); 468 extern int scsi_vpd_tpg_id(struct scsi_device *, int *); 469 470 #ifdef CONFIG_PM 471 extern int scsi_autopm_get_device(struct scsi_device *); 472 extern void scsi_autopm_put_device(struct scsi_device *); 473 #else 474 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; } 475 static inline void scsi_autopm_put_device(struct scsi_device *d) {} 476 #endif /* CONFIG_PM */ 477 478 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev) 479 { 480 return device_reprobe(&sdev->sdev_gendev); 481 } 482 483 static inline unsigned int sdev_channel(struct scsi_device *sdev) 484 { 485 return sdev->channel; 486 } 487 488 static inline unsigned int sdev_id(struct scsi_device *sdev) 489 { 490 return sdev->id; 491 } 492 493 #define scmd_id(scmd) sdev_id((scmd)->device) 494 #define scmd_channel(scmd) sdev_channel((scmd)->device) 495 496 /* 497 * checks for positions of the SCSI state machine 498 */ 499 static inline int scsi_device_online(struct scsi_device *sdev) 500 { 501 return (sdev->sdev_state != SDEV_OFFLINE && 502 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE && 503 sdev->sdev_state != SDEV_DEL); 504 } 505 static inline int scsi_device_blocked(struct scsi_device *sdev) 506 { 507 return sdev->sdev_state == SDEV_BLOCK || 508 sdev->sdev_state == SDEV_CREATED_BLOCK; 509 } 510 static inline int scsi_device_created(struct scsi_device *sdev) 511 { 512 return sdev->sdev_state == SDEV_CREATED || 513 sdev->sdev_state == SDEV_CREATED_BLOCK; 514 } 515 516 int scsi_internal_device_block_nowait(struct scsi_device *sdev); 517 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev, 518 enum scsi_device_state new_state); 519 520 /* accessor functions for the SCSI parameters */ 521 static inline int scsi_device_sync(struct scsi_device *sdev) 522 { 523 return sdev->sdtr; 524 } 525 static inline int scsi_device_wide(struct scsi_device *sdev) 526 { 527 return sdev->wdtr; 528 } 529 static inline int scsi_device_dt(struct scsi_device *sdev) 530 { 531 return sdev->ppr; 532 } 533 static inline int scsi_device_dt_only(struct scsi_device *sdev) 534 { 535 if (sdev->inquiry_len < 57) 536 return 0; 537 return (sdev->inquiry[56] & 0x0c) == 0x04; 538 } 539 static inline int scsi_device_ius(struct scsi_device *sdev) 540 { 541 if (sdev->inquiry_len < 57) 542 return 0; 543 return sdev->inquiry[56] & 0x01; 544 } 545 static inline int scsi_device_qas(struct scsi_device *sdev) 546 { 547 if (sdev->inquiry_len < 57) 548 return 0; 549 return sdev->inquiry[56] & 0x02; 550 } 551 static inline int scsi_device_enclosure(struct scsi_device *sdev) 552 { 553 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1; 554 } 555 556 static inline int scsi_device_protection(struct scsi_device *sdev) 557 { 558 if (sdev->no_dif) 559 return 0; 560 561 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0); 562 } 563 564 static inline int scsi_device_tpgs(struct scsi_device *sdev) 565 { 566 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0; 567 } 568 569 /** 570 * scsi_device_supports_vpd - test if a device supports VPD pages 571 * @sdev: the &struct scsi_device to test 572 * 573 * If the 'try_vpd_pages' flag is set it takes precedence. 574 * Otherwise we will assume VPD pages are supported if the 575 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set. 576 */ 577 static inline int scsi_device_supports_vpd(struct scsi_device *sdev) 578 { 579 /* Attempt VPD inquiry if the device blacklist explicitly calls 580 * for it. 581 */ 582 if (sdev->try_vpd_pages) 583 return 1; 584 /* 585 * Although VPD inquiries can go to SCSI-2 type devices, 586 * some USB ones crash on receiving them, and the pages 587 * we currently ask for are mandatory for SPC-2 and beyond 588 */ 589 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages) 590 return 1; 591 return 0; 592 } 593 594 static inline int scsi_device_busy(struct scsi_device *sdev) 595 { 596 return sbitmap_weight(&sdev->budget_map); 597 } 598 599 #define MODULE_ALIAS_SCSI_DEVICE(type) \ 600 MODULE_ALIAS("scsi:t-" __stringify(type) "*") 601 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x" 602 603 #endif /* _SCSI_SCSI_DEVICE_H */ 604